Imaging apparatus and monitoring system

Abstract

An imaging apparatus includes an image sensor, an angle controller configured to change an angle between a plane orthogonal to an optical axis of an imaging optical system and an imaging plane of the image sensor, an illuminator; and an illumination controller configured to change an optical axis direction of the illuminator based on the angle.

What is claimed is: 
     
       1. An imaging apparatus comprising:
 an image sensor; 
 an angle controlling unit configured to change an angle between a plane orthogonal to an optical axis of an imaging optical system and an imaging plane of the image sensor; 
 an illumination unit; and 
 an illumination controlling unit configured to change an illumination range of the illumination unit based on the angle. 
 
     
     
       2. The imaging apparatus according to  claim 1 , wherein the illumination unit includes a first illumination element and a second illumination element having different illumination ranges. 
     
     
       3. The imaging apparatus according to  claim 2 ,
 wherein the illumination controlling unit controls the illumination range of the first illumination element and the illumination range of the second illumination element by controlling a current flowing through the first illumination element and a current flowing through the second illumination element. 
 
     
     
       4. The imaging apparatus according to  claim 2 ,
 wherein the illumination controlling unit controls the illumination range of the first illumination element and the illumination range of the second illumination element based on a ratio between a current flowing through the first illumination element and a current flowing through the second illumination element. 
 
     
     
       5. The imaging apparatus according to  claim 2 , wherein an angle between an optical axis of the first illumination element and the optical axis of the imaging optical system is larger than an angle between an optical axis of the second illumination element and the optical axis of the imaging optical system, and
 wherein the illumination range of the first illumination element is narrower than the illumination range of the second illumination element. 
 
     
     
       6. The imaging apparatus according to  claim 1 , wherein the illumination unit includes a first illumination element for illuminating a first region where a distance from the first illumination element is a first distance, and a second illumination element for illuminating a second region where a distance from the second illumination element is a second distance longer than the first distance, wherein the first region and the second region are on a focus plane determined based on the angle, wherein the illumination controlling unit controls so that a current flowing through the second illumination element is larger than a current flowing through the first illumination element. 
     
     
       7. A control method of an imaging apparatus comprising the steps of:
 changing an angle between a plane orthogonal to an optical axis of an imaging optical system and an imaging plane of an image sensor; and 
 changing an illumination range of an illumination unit based on the angle. 
 
     
     
       8. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a control method of an imaging apparatus, the method comprising the steps of:
 changing an angle between a plane orthogonal to an optical axis of an imaging optical system and an imaging plane of an image sensor; and 
 changing an illumination range of an illumination unit based on the angle.